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shader: Fix tracking

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This commit is contained in:
ReinUsesLisp
2021-02-15 00:07:52 -03:00
committed by ameerj
parent 1b0cf2309c
commit 1c0b8bca5e
1 changed files with 72 additions and 50 deletions
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122
src/shader_recompiler/ir_opt/global_memory_to_storage_buffer_pass.cpp
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@@ -142,6 +142,58 @@ void DiscardGlobalMemory(IR::Block& block, IR::Block::iterator inst) {
}
}
struct LowAddrInfo {
IR::U32 value;
s32 imm_offset;
};
/// Tries to track the first 32-bits of a global memory instruction
std::optional<LowAddrInfo> TrackLowAddress(IR::Inst* inst) {
// The first argument is the low level GPU pointer to the global memory instruction
const IR::U64 addr{inst->Arg(0)};
if (addr.IsImmediate()) {
// Not much we can do if it's an immediate
return std::nullopt;
}
// This address is expected to either be a PackUint2x32 or a IAdd64
IR::Inst* addr_inst{addr.InstRecursive()};
s32 imm_offset{0};
if (addr_inst->Opcode() == IR::Opcode::IAdd64) {
// If it's an IAdd64, get the immediate offset it is applying and grab the address
// instruction. This expects for the instruction to be canonicalized having the address on
// the first argument and the immediate offset on the second one.
const IR::U64 imm_offset_value{addr_inst->Arg(1)};
if (!imm_offset_value.IsImmediate()) {
return std::nullopt;
}
imm_offset = static_cast<s32>(static_cast<s64>(imm_offset_value.U64()));
const IR::U64 iadd_addr{addr_inst->Arg(0)};
if (iadd_addr.IsImmediate()) {
return std::nullopt;
}
addr_inst = iadd_addr.Inst();
}
// With IAdd64 handled, now PackUint2x32 is expected without exceptions
if (addr_inst->Opcode() != IR::Opcode::PackUint2x32) {
return std::nullopt;
}
// PackUint2x32 is expected to be generated from a vector
const IR::Value vector{addr_inst->Arg(0)};
if (vector.IsImmediate()) {
return std::nullopt;
}
// This vector is expected to be a CompositeConstructU32x2
IR::Inst* const vector_inst{vector.InstRecursive()};
if (vector_inst->Opcode() != IR::Opcode::CompositeConstructU32x2) {
return std::nullopt;
}
// Grab the first argument from the CompositeConstructU32x2, this is the low address.
return LowAddrInfo{
.value{IR::U32{vector_inst->Arg(0)}},
.imm_offset{imm_offset},
};
}
/// Recursively tries to track the storage buffer address used by a global memory instruction
std::optional<StorageBufferAddr> Track(const IR::Value& value, const Bias* bias) {
if (value.IsImmediate()) {
@@ -191,13 +243,26 @@ void CollectStorageBuffers(IR::Block& block, IR::Block::iterator inst,
};
// First try to find storage buffers in the NVN address
const IR::U64 addr{inst->Arg(0)};
std::optional<StorageBufferAddr> storage_buffer{Track(addr, &nvn_bias)};
if (addr.IsImmediate()) {
// Immediate addresses can't be lowered to a storage buffer
DiscardGlobalMemory(block, inst);
return;
}
// Track the low address of the instruction
const std::optional<LowAddrInfo> low_addr_info{TrackLowAddress(addr.InstRecursive())};
if (!low_addr_info) {
DiscardGlobalMemory(block, inst);
return;
}
const IR::U32 low_addr{low_addr_info->value};
std::optional<StorageBufferAddr> storage_buffer{Track(low_addr, &nvn_bias)};
if (!storage_buffer) {
// If it fails, track without a bias
storage_buffer = Track(addr, nullptr);
storage_buffer = Track(low_addr, nullptr);
if (!storage_buffer) {
// If that also failed, drop the global memory usage
DiscardGlobalMemory(block, inst);
return;
}
}
// Collect storage buffer and the instruction
@@ -208,58 +273,15 @@ void CollectStorageBuffers(IR::Block& block, IR::Block::iterator inst,
});
}
/// Tries to track the first 32-bits of a global memory instruction
std::optional<IR::U32> TrackLowAddress(IR::IREmitter& ir, IR::Inst* inst) {
// The first argument is the low level GPU pointer to the global memory instruction
const IR::U64 addr{inst->Arg(0)};
if (addr.IsImmediate()) {
// Not much we can do if it's an immediate
return std::nullopt;
}
// This address is expected to either be a PackUint2x32 or a IAdd64
IR::Inst* addr_inst{addr.InstRecursive()};
s32 imm_offset{0};
if (addr_inst->Opcode() == IR::Opcode::IAdd64) {
// If it's an IAdd64, get the immediate offset it is applying and grab the address
// instruction. This expects for the instruction to be canonicalized having the address on
// the first argument and the immediate offset on the second one.
const IR::U64 imm_offset_value{addr_inst->Arg(1)};
if (!imm_offset_value.IsImmediate()) {
return std::nullopt;
}
imm_offset = static_cast<s32>(static_cast<s64>(imm_offset_value.U64()));
const IR::U64 iadd_addr{addr_inst->Arg(0)};
if (iadd_addr.IsImmediate()) {
return std::nullopt;
}
addr_inst = iadd_addr.Inst();
}
// With IAdd64 handled, now PackUint2x32 is expected without exceptions
if (addr_inst->Opcode() != IR::Opcode::PackUint2x32) {
return std::nullopt;
}
// PackUint2x32 is expected to be generated from a vector
const IR::Value vector{addr_inst->Arg(0)};
if (vector.IsImmediate()) {
return std::nullopt;
}
// This vector is expected to be a CompositeConstructU32x2
IR::Inst* const vector_inst{vector.InstRecursive()};
if (vector_inst->Opcode() != IR::Opcode::CompositeConstructU32x2) {
return std::nullopt;
}
// Grab the first argument from the CompositeConstructU32x2, this is the low address.
// Re-apply the offset in case we found one.
const IR::U32 low_addr{vector_inst->Arg(0)};
return imm_offset != 0 ? IR::U32{ir.IAdd(low_addr, ir.Imm32(imm_offset))} : low_addr;
}
/// Returns the offset in indices (not bytes) for an equivalent storage instruction
IR::U32 StorageOffset(IR::Block& block, IR::Block::iterator inst, StorageBufferAddr buffer) {
IR::IREmitter ir{block, inst};
IR::U32 offset;
if (const std::optional<IR::U32> low_addr{TrackLowAddress(ir, &*inst)}) {
offset = *low_addr;
if (const std::optional<LowAddrInfo> low_addr{TrackLowAddress(&*inst)}) {
offset = low_addr->value;
if (low_addr->imm_offset != 0) {
offset = ir.IAdd(offset, ir.Imm32(low_addr->imm_offset));
}
} else {
offset = ir.ConvertU(32, IR::U64{inst->Arg(0)});
}